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I am coding virtual numerical keyboard. Can I please have an advice why my code doesn't work?
<!DOCTYPE html>
<html>
<head>
<style>
#import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght#300&display=swap');
body {
font-family: 'Open Sans', sans-serif;
}
</style>
</head>
<body>
<input id="myInput" type="text" />
<br /><br />
<input type="button" value=1 onclick="input(1);" />
<input type="button" value=2 onclick="input(2);" />
<input type="button" value=3 onclick="input(3);" />
<br />
<input type="button" value=4 onclick="input(4);" />
<input type="button" value=5 onclick="input(5);" />
<input type="button" value=6 onclick="input(6);" />
<br />
<input type="button" value=7 onclick="input(7);" />
<input type="button" value=8 onclick="input(8);" />
<input type="button" value=9 onclick="input(9);" />
<br /><br />
<input type="button" value=backspace onclick="del();" />
<script>
function input(e) {
var myInput = document.getElementById("myInput”);
myInput.value = myInput.value + e.value;
}
function del() {
var myInput = document.getElementById("myInput");
myInput.value = myInput.value.substr(0, myInput.value.length - 1);
}
</script>
</body>
</html>
I am also thinking why do the buttons have different width, considering that Open Sans is a monospaced font...
Thank you.
<!DOCTYPE html>
<html>
<head>
<style>
#import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght#300&display=swap');
body {
font-family: 'Open Sans', sans-serif;
}
</style>
</head>
<body>
<input id="myInput" type="text" />
<br /><br />
<input type="button" value=1 onclick="input(1);" />
<input type="button" value=2 onclick="input(2);" />
<input type="button" value=3 onclick="input(3);" />
<br />
<input type="button" value=4 onclick="input(4);" />
<input type="button" value=5 onclick="input(5);" />
<input type="button" value=6 onclick="input(6);" />
<br />
<input type="button" value=7 onclick="input(7);" />
<input type="button" value=8 onclick="input(8);" />
<input type="button" value=9 onclick="input(9);" />
<br /><br />
<input type="button" value=backspace onclick="del();" />
<script>
function input(e) {
var myInput = document.getElementById("myInput");
myInput.value += e;
}
function del() {
var myInput = document.getElementById("myInput");
myInput.value = myInput.value.substr(0, myInput.value.length - 1);
}
</script>
</body>
</html>
You need to use
var myInput = document.getElementById("myInput");
instead of
var myInput = document.getElementById("myInput”);
that's it.
Also value is e only not e.value.
myInput.value = myInput.value + e;
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i have made a simple calculator and i am unable to print the value of my buttons on click onto the text field. How do i do that? I want to use JavaScript only, not JQuery. When i click on my buttons the values are not displaying on the text field "scr". How can i implement that?
here is my code:
<html>
<head>
<title>Calculator</title>
<style>
</style>
<script type="javascript">
function display0()
{
a=document.all.f1.zero.value;
document.all.getElementById("scr").innerHTML=a;
b=document.all.f1.one.value;
document.all.getElementById('scr').value=b;
c=document.all.f1.two.value;
document.all.getElementById("scr").innerHTML=c;
d=document.all.f1.three.value;
document.all.getElementById("scr").innerHTML=d;
e=document.all.f1.four.value;
document.all.getElementById("scr").innerHTML=e;
f=document.all.f1.five.value;
document.all.getElementById("scr").innerHTML=f;
g=document.all.f1.six.value;
document.all.getElementById("scr").innerHTML=g;
h=document.all.f1.seven.value;
document.all.getElementById("scr").innerHTML=h;
i=document.all.f1.eight.value;
document.all.getElementById("scr").innerHTML=i;
j=document.all.f1.nine.value;
document.all.getElementById("scr").innerHTML=j;
k=document.all.f1.sum.value;
document.all.getElementById("scr").innerHTML=k;
l=document.all.f1.sub;
document.all.getElementById("scr").innerHTML=l;
m=document.all.f1.mul;
document.all.getElementById("scr").innerHTML=m;
n=document.all.f1.div;
document.all.getElementById("scr").innerHTML=n;
o=document.all.f1.clear;
document.all.getElementById("scr").innerHTML=o;
}
</script>
</head>
<body>
<form name="f1" id="f1" method="post">
<div>
<input type="text" id="scr" name="scr" />
</div>
<br/>
<div>
<input type="button" value="7" onclick="display7()" id="seven"name="seven"/>
<input type="button" value="8" onclick="display8()" id="eight"name="eight"/>
<input type="button" value="9" onclick="display9()" id="nine"name="nine"/>
<input type="button" value="/" onclick="display/()" id="div"name="div"/>
<br/>
<input type="button" value="4" onclick="display4()" id="four"name="four"/>
<input type="button" value="5" onclick="display5()" id="five"name="five"/>
<input type="button" value="6" onclick="display6()" id="six"name="six"/>
<input type="button" value="X" onclick="displayX()" id="mul"name="mul"/>
<br/>
<input type="button" value="1" onclick="display()" id="one" name="one" />
<input type="button" value="2" onclick="display2()" id="two"name="two"/>
<input type="button" value="3" onclick="display3()" id="three"name="three"/>
<input type="button" value="-" onclick="display-()" id="sub"name="sub"/>
<br/>
<input type="button" value="CLR" onclick="displayC()"/>
<input type="button" value="0" onclick="display0()" id="zero"name="zero"/>
<input type="button" value="=" onclick="display=()" id="eq"name="eq"/>
<input type="button" value="+" onclick="display+()" id="sum"name="sum"/>
</div>
<br/>
</form>
</body>
</html>
<input type="button" value="test" onClick="document.getElementById('textfield').innerHTML=this.value">
<div id="textfield"></div>
You can try this
HTML
<button id="plus">Plus</button>
<input type="text" id="ih"></input>
Javascript
document.getElementById("ih").value=document.getElementById("plus").innerHTML;
Try this:
var showValue = function(val){
document.getElementById('pressed').value = parseInt(val);
}
<p><input type="text" id="pressed" value="" /></p>
<p>
<button onclick="showValue(1)">1</button>
<button onclick="showValue(2)">2</button>
<button onclick="showValue(3)">3</button>
</p>
The code given below does not work.
<html>
<head>
<script type="text/javascript">
function dosomething(ID){
var name = document.getElementById(ID).value;
alert(name);
}
</script>
</head>
<body>
<input type="text" id="name1" /><input type="button" value="click" onclick="dosomething("name1")" />
<br /><br />
<input type="text" id="name2" /><input type="button" value="click" onclick="dosomething("name2")" />
</body>
</html>
Your issue is with the quotes not used properly, console should show you the syntax error.
<input type="button" value="click" onclick="dosomething("name1")" />
to
<input type="button" value="click" onclick="dosomething('name1')" />
Fiddle
i have the following form
<html>
<head>
<style type="text/css">
.on {
border:1px outset;
color:#369;
background:#efefef;
}
.off {
border:1px outset;
color:#369;
background:#f9d543;
}
</style>
<script language="javascript">
function togglestyle(el){
if(el.className == "on") {
el.className="off";
} else {
el.className="on";
}
}
</script>
</head>
<body>
<form method="POST" action="#" >
<input type="button" id="btn" value="1" name="a[]" class="off" onclick="togglestyle(this)" />
<input type="button" id="btn" value="2" name="a[]" class="off" onclick="togglestyle(this)" />
<input type="button" id="btn" value="3" name="a[]" class="off" onclick="togglestyle(this)" />
<input type="button" id="btn" value="4" name="a[]" class="off" onclick="togglestyle(this)" />
<input type="button" id="btn" value="5" name="a[]" class="off" onclick="togglestyle(this)" />
<input type="button" id="btn" value="6" name="a[]" class="off" onclick="togglestyle(this)" />
<input type="submit" name="submit" value="Submit" />
</form>
</body>
</html>
Here i want to use toggle action, i dont want to use checkbox here, I want to pass the toggled value from this form. Is there any way to do this?
in the same page i already have some checkbox with with check action enabled, here i want to pass max 3 toggled values, i have tried using radio box but that will work only for one, not with 3. how to do this.
How come method equal always returns with an "undefined" followed by a number?
and when I try to parse it. it returns me a NaN.
<!DOCTYPE>
<html>
<head>
<script>
var fnum;
var secondNum;
var operation;
function msg(val) {
document.getElementById("fnumtext").value += val;
fnum += val;
}
function showOperation(oper)
{
document.getElementById("fnumtext").value = "";
document.getElementById("operation").value = oper;
operation = oper;
}
function equal() {
secondNum = document.getElementById("fnumtext").value;
alert(fnum);
}
</script>
</head>
<body>
<input id = "fnumtext"type="text" name="firstnum" /><br />
<input id = "operation" type="text" name="secondnum" /><br />
<input type="button" value="1" onclick="msg('1')" />
<input type="button" value="2" onclick="msg('2')" />
<input type="button" value="3" onclick="msg('3')" /></br>
<input type="button" value="4" onclick="msg('4')" />
<input type="button" value="5" onclick="msg('5')" />
<input type="button" value="6" onclick="msg('6')" /><br/>
<input type="button" value="7" onclick="msg('7')" />
<input type="button" value="8" onclick="msg('8')" />
<input type="button" value="9" onclick="msg('9')" /></br>
<input type="button" value="0" onclick="msg('0')" /></br>
<input type="button" value="+" onclick="showOperation('+')" />
<input type="button" value="*" onclick="showOperation('*')" />
<input type="button" value="/" onclick="showOperation('/')" />
<input type="button" value="-" onclick="showOperation('-')" />
<input type="button" value="=" onclick="equal()" />
</body>
</html>
Your val variable in the msg() function is inputted as a string. So when you attempt to do +=, it treats its original value as a string so you end up doing 'undefined' + <some integer> creating your effect.
Try removing the single quotes from all your function calls in your onclick events, and just send the integer. Also, you should define var fnum = 0; rather than just declaring the variable if you want to use the += operator.
You call "alert" with "fnum" variable as param. It can be undefined if you press "equal" before pressing any other button
How can I write numeric numbers into an input field by pressing a button?
Suppose I have a button:
<input type="button" value="1">
Then I want, that when numeric pad button 1 is pressed it adds numeric words just like Windows Calculator.
I'm not sure what you are asking, but this code will add numbers to an input box (using jQuery).
HTML
<input id="data" type="text" />
<br />
<br />
<input type="button" value="1" />
<input type="button" value="2" />
<input type="button" value="3" /><br />
<input type="button" value="4" />
<input type="button" value="5" />
<input type="button" value="6" /><br />
<input type="button" value="7" />
<input type="button" value="8" />
<input type="button" value="9" />
Script
$(document).ready(function(){
$(':button').click(function(){
$('#data').val( $('#data').val() + $(this).val() );
})
})